WordPress filter corrupts JavaScript regex by altering ampersand character

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A developer discovered that a JavaScript tool embedded within a WordPress post functioned correctly locally but failed on the live site. The failure caused numeric digits to be replaced with the string 'undefined'. The issue was traced to WordPress's wptexturize filter converting a standalone ampersand (&) in a regex character class to its HTML entity (&). This altered the regex's matching behavior, causing it to incorrectly target digits 0, 3, and 8. The developer now recommends using Unicode escapes or external script files to avoid the filter.

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